What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: flight 5275 departed phx enroute to flg. VMC prevailed. After departure and climbing, the bleed air was selected by the f/o. the crew heard rushing air and checked the cabin door. No lights illuminated on the annunciator panel. The crew determined the aft cargo door had opened. An emergency was declared and the aircraft returned to phx without further incident. The PIC reported that during descent at approximately 500' AGL he pushed the "press to test" button on the annunciator panel and all the lights illuminated. When he released the button "then" the aft cargo door warning light remained illuminated. The light remained on during taxi to the gate. After passenger deplaning the PIC turned power back on and the aft cargo door (open) light would not illuminate until it was tapped with a finger.
As the FAA filed it
NARRATIVE: FLIGHT 5275 DEPARTED PHX ENROUTE TO FLG. VMC PREVAILED. AFTER DEPARTURE AND CLIMBING, THE BLEED AIR WAS SELECTED BY THE F/O. THE CREW HEARD RUSHING AIR AND CHECKED THE CABIN DOOR. NO LIGHTS ILLUMINATED ON THE ANNUNCIATOR PANEL. THE CREW DETERMINED THE AFT CARGO DOOR HAD OPENED. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO PHX WITHOUT FURTHER INCIDENT. THE PIC REPORTED THAT DURING DESCENT AT APPROXIMATELY 500' AGL HE PUSHED THE "PRESS TO TEST" BUTTON ON THE ANNUNCIATOR PANEL AND ALL THE LIGHTS ILLUMINATED. WHEN HE RELEASED THE BUTTON "THEN" THE AFT CARGO DOOR WARNING LIGHT REMAINED ILLUMINATED. THE LIGHT REMAINED ON DURING TAXI TO THE GATE. AFTER PASSENGER DEPLANING THE PIC TURNED POWER BACK ON AND THE AFT CARGO DOOR (OPEN) LIGHT WOULD NOT ILLUMINATE UNTIL IT WAS TAPPED WITH A FINGER.